The middle-upper Eocene Loza-Portilla Formation (Western Pyrenees, North Spain): Palustrine-lacustrine carbonate-dominated sequences in a piggy-back basin under compressional tectonic stress

The Loza-Portilla Formation consists of 100–300 m of alluvial siliciclastics and palustrine-lacustrine carbonates and minor evaporites, infilling a tectonically active syncline basin (Miranda-Trebiño Basin, Basque-Cantabrian Pyrenees), which developed over the south Pyrenean Thrust Front during midd...

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Autores: Larena, Zuriñe, Murelaga Bereicua, Javier, Sanjuan, Josep, Ruiz, F. Javier, Baceta Caballero, Juan Ignacio
Tipo de recurso: artículo
Fecha de publicación:2025
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/76381
Acceso en línea:http://hdl.handle.net/10810/76381
Access Level:acceso abierto
Palabra clave:Eocene
lacustrine-palustrine sequences
Miranda-Trebiño Basin
tectonic control
Western Pyrenees
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spelling The middle-upper Eocene Loza-Portilla Formation (Western Pyrenees, North Spain): Palustrine-lacustrine carbonate-dominated sequences in a piggy-back basin under compressional tectonic stressLarena, ZuriñeMurelaga Bereicua, JavierSanjuan, JosepRuiz, F. JavierBaceta Caballero, Juan IgnacioEocenelacustrine-palustrine sequencesMiranda-Trebiño Basintectonic controlWestern PyreneesThe Loza-Portilla Formation consists of 100–300 m of alluvial siliciclastics and palustrine-lacustrine carbonates and minor evaporites, infilling a tectonically active syncline basin (Miranda-Trebiño Basin, Basque-Cantabrian Pyrenees), which developed over the south Pyrenean Thrust Front during middle to late Eocene times. Detailed facies characterisation and correlation allowed the reconstruction of the stratigraphic architecture of the formation, which consists of three unconformity-bounded depositional sequences, representative of three successive phases of carbonate lake development. A model of low-energy shallow lake with ramp margins and wide palustrine fringes fits well with the architecture of the three stacked carbonate-dominated sequences, with stratal architectures characteristic of shallow balanced-fill lake basins. A range of limestones representative of different palustrine and lacustrine environments is distinguished, commonly arranged in metre-thick facies sequences and cycles reflecting water-level changes and marked shoreline shifts, likely associated with prevailing tectonic and climate conditions. Compressional tectonism and associated halokinetic movements exerted major control on depositional trends and distribution of the main depocentres. The Loza-Portilla Formation is of major palaeogeographical significance in the tecto-sedimentary evolution of the Pyrenean domain, labelling the first phase of uplift and emersion that affected large areas of the Basque-Cantabrian (western) Pyrenees, prior to end-Eocene generalised continentalisation.This research was supported by a pre-Doctoral research grant from the University of the Basque Country (UPV/EHU) to Z.L. (first author). It is also a contribution to the Consolidate Research Group IT-1602-22 of the Basque Government University Research System.Wiley202520252025info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/76381reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoIngléshttps://onlinelibrary.wiley.com/doi/10.1002/dep2.298info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/© 2024 The Author(s). The Depositional Record published by John Wiley & Sons Ltd on behalf of International Association of Sedimentologists. This is an open access article under the terms of the Creative Commons Attribution Licenseoai:addi.ehu.eus:10810/763812026-06-18T09:23:17Z
dc.title.none.fl_str_mv The middle-upper Eocene Loza-Portilla Formation (Western Pyrenees, North Spain): Palustrine-lacustrine carbonate-dominated sequences in a piggy-back basin under compressional tectonic stress
title The middle-upper Eocene Loza-Portilla Formation (Western Pyrenees, North Spain): Palustrine-lacustrine carbonate-dominated sequences in a piggy-back basin under compressional tectonic stress
spellingShingle The middle-upper Eocene Loza-Portilla Formation (Western Pyrenees, North Spain): Palustrine-lacustrine carbonate-dominated sequences in a piggy-back basin under compressional tectonic stress
Larena, Zuriñe
Eocene
lacustrine-palustrine sequences
Miranda-Trebiño Basin
tectonic control
Western Pyrenees
title_short The middle-upper Eocene Loza-Portilla Formation (Western Pyrenees, North Spain): Palustrine-lacustrine carbonate-dominated sequences in a piggy-back basin under compressional tectonic stress
title_full The middle-upper Eocene Loza-Portilla Formation (Western Pyrenees, North Spain): Palustrine-lacustrine carbonate-dominated sequences in a piggy-back basin under compressional tectonic stress
title_fullStr The middle-upper Eocene Loza-Portilla Formation (Western Pyrenees, North Spain): Palustrine-lacustrine carbonate-dominated sequences in a piggy-back basin under compressional tectonic stress
title_full_unstemmed The middle-upper Eocene Loza-Portilla Formation (Western Pyrenees, North Spain): Palustrine-lacustrine carbonate-dominated sequences in a piggy-back basin under compressional tectonic stress
title_sort The middle-upper Eocene Loza-Portilla Formation (Western Pyrenees, North Spain): Palustrine-lacustrine carbonate-dominated sequences in a piggy-back basin under compressional tectonic stress
dc.creator.none.fl_str_mv Larena, Zuriñe
Murelaga Bereicua, Javier
Sanjuan, Josep
Ruiz, F. Javier
Baceta Caballero, Juan Ignacio
author Larena, Zuriñe
author_facet Larena, Zuriñe
Murelaga Bereicua, Javier
Sanjuan, Josep
Ruiz, F. Javier
Baceta Caballero, Juan Ignacio
author_role author
author2 Murelaga Bereicua, Javier
Sanjuan, Josep
Ruiz, F. Javier
Baceta Caballero, Juan Ignacio
author2_role author
author
author
author
dc.subject.none.fl_str_mv Eocene
lacustrine-palustrine sequences
Miranda-Trebiño Basin
tectonic control
Western Pyrenees
topic Eocene
lacustrine-palustrine sequences
Miranda-Trebiño Basin
tectonic control
Western Pyrenees
description The Loza-Portilla Formation consists of 100–300 m of alluvial siliciclastics and palustrine-lacustrine carbonates and minor evaporites, infilling a tectonically active syncline basin (Miranda-Trebiño Basin, Basque-Cantabrian Pyrenees), which developed over the south Pyrenean Thrust Front during middle to late Eocene times. Detailed facies characterisation and correlation allowed the reconstruction of the stratigraphic architecture of the formation, which consists of three unconformity-bounded depositional sequences, representative of three successive phases of carbonate lake development. A model of low-energy shallow lake with ramp margins and wide palustrine fringes fits well with the architecture of the three stacked carbonate-dominated sequences, with stratal architectures characteristic of shallow balanced-fill lake basins. A range of limestones representative of different palustrine and lacustrine environments is distinguished, commonly arranged in metre-thick facies sequences and cycles reflecting water-level changes and marked shoreline shifts, likely associated with prevailing tectonic and climate conditions. Compressional tectonism and associated halokinetic movements exerted major control on depositional trends and distribution of the main depocentres. The Loza-Portilla Formation is of major palaeogeographical significance in the tecto-sedimentary evolution of the Pyrenean domain, labelling the first phase of uplift and emersion that affected large areas of the Basque-Cantabrian (western) Pyrenees, prior to end-Eocene generalised continentalisation.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/76381
url http://hdl.handle.net/10810/76381
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://onlinelibrary.wiley.com/doi/10.1002/dep2.298
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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